The ghost town that ended up on Ebay.

Odd outsider art installations surround a Gold Rush-era ghost town.

The only diamond mine in the world where you can keep what you find.

A popular rock that acted as a waymarker for American pioneers.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

This erect, phallic geological spire wasn't always named so domestically.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Canada’s surprisingly controversial monument to Dwight Eisenhower.

What was once a unique system of urban elevators is turning into a mechanical ruin.

The largest geyser field in the southern hemisphere is a spectacular sight.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.

A world-class observatory in the California desert.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A historic train ride from California to Mexico.

This historic tower in the California desert promises visitors a "vortex of good vibes".

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

A shrine built to combat the bad karma of a commercial venture.

An ancient fortification lives on in this Chinese city.

This Tang Dynasty behemoth is the biggest Buddha in the world.